AWK - Re: bash to awk

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Re: bash to awk

Ed Morton

2004-03-19, 8:23 pm

davide moro wrote:

> Today I made this bash-script, can you help me to translate it to awk-code?
> Its prototype is:
> ls -l | ./script 1 7 9 12
> It prints the 1st, 7th, 9th and 12th record of any stream of characters (for
> example: ls -l, cat file1, ecc)
<snip>
> AWK:
> example: ls -l | ./script.awk 1 7 10
> I have this idea
> {
> if (count == ???????)
> print;
> count++;
> }
>
> but I don't know what I should write instead of ?????.
> Can anyone help me?

Here's one way:

lineNrs="1 7 10"
awk -v lineNrString="$lineNrs" 'BEGIN {
split(lineNrString,i2LNs)
for (i in i2LNs) lineNrs[i2LNs[i]] = i
}
NR in lineNrs { print }'

Regards,

Ed.

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